<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <h1>动态创建列表</h1>
  <ul class="list"></ul>

  <script>
    var ulEl = document.querySelector('.list')
    var btnEl = document.querySelector('.add')
    var isFlag = true
    while (isFlag) {
      var message = prompt("请输入信息:")
      if (!message) {
        isFlag = false
      } else {
        var liEl = document.createElement('li')
        liEl.textContent = message
        ulEl.append(liEl)
      }
    }

  </script>
</body>

</html>